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DEVELOPMENT OF STATISTICAL DISTRIBUTIONS OR RANGES OF STANDARD FACTORS USED IN EXPOSURE ASSESSMENTS
Citation:
Anderson, E., N. Browne, S. Duletsky, J. Ramig, AND T. Warn. DEVELOPMENT OF STATISTICAL DISTRIBUTIONS OR RANGES OF STANDARD FACTORS USED IN EXPOSURE ASSESSMENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/8-85/010.
Description:
This document is intended to support EPA's Exposure Assessment Guidelines by providing data and information on standard factors that are used to calculate human exposure to toxic substances. tatistical distributions or ranges of values were developed for body weight, skin surface area, and ventilation rates. ercentile distributions of body weight were computed from the Second National Health and Nutrition Examination Survey (NHANES II) data base using a computer program that performs variance estimation of multistage sample data using the Jackknife Repeated Replicate approach. istributions of skin surface areas were similarly calculated from NHANES height and weight data by applying regression equations that were either located in the literature or were developed by multivariate analysis of available measurements. Insufficient data precluded the development of distributions of ventilation rates. inimum, maximum, and mean values of minute ventilation at three activity levels were calculated from available measurements. ctivity pattern information is presented to permit the calculation of time-weighted average ventilation rates.